Initial commit

.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+
+# pycharm
+.idea/
+
+# pytest
+.pytest_cache/

.travis.yml

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+sudo: false
+language: python
+python:
+  - "2.7"
+  - "3.6"
+install: pip install tox-travis
+script: tox

LICENSE

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+MIT License
+
+Copyright (c) 2018 H. Chase Stevens
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# bellybutton
+
+[![Build Status](https://travis-ci.org/hchasestevens/astlint.svg?branch=master)](https://travis-ci.org/hchasestevens/astlint)

bellybutton/caching.py

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+"""Caching utilities."""
+
+
+

bellybutton/cli.py

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+"""Command-line interface."""

bellybutton/linting.py

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+"""Linting engine."""

bellybutton/parsing.py

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+"""YAML parsing."""
+import re
+
+import yaml
+from lxml.etree import XPath
+
+
+def constructor(tag=None, pattern=None):
+    """Register custom constructor with pyyaml."""
+    def decorator(f):
+        if tag is None or f is tag:
+            tag_ = '!{}'.format(f.__name__)
+        else:
+            tag_ = tag
+        yaml.add_constructor(tag_, f)
+        if pattern is not None:
+            yaml.add_implicit_resolver(tag_, re.compile(pattern))
+        return f
+    if callable(tag):  # little convenience hack to avoid empty arg list
+        return decorator(tag)
+    return decorator
+
+
+@constructor(pattern=r'/.+')
+def xpath(loader, node):
+    """Construct XPath expressions."""
+    value = loader.construct_scalar(node)
+    return XPath(value)
+
+
+@constructor
+def regex(loader, node):
+    """Construct regular expressions."""
+    value = loader.construct_scalar(node)
+    return re.compile(value)
+
+
+@constructor
+def verbal(loader, node):
+    """Construct verbal expressions."""
+    values = loader.construct_sequence(node)
+    pass  # todo: verbal expressions
+
+
+@constructor
+def chain(loader, node):
+    """Construct pipelines of other constructors."""
+    values = loader.construct_sequence(node)
+    pass  # todo: chain constructors (viz. xpath then regex)

setup.py

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+from setuptools import setup
+
+setup(
+    name='bellybutton',
+    packages=['bellybutton'],
+    platforms='any',
+    version='0.0.1',
+    description='Custom Python linting through AST expressions.',
+    author='H. Chase Stevens',
+    author_email='chase@chasestevens.com',
+    url='https://github.com/hchasestevens/bellybutton',
+    license='MIT',
+    install_requires=[
+        'astpath[xpath]>=0.6.1',
+        'pyyaml>=3.12',
+    ],
+    tests_require=['pytest>=3.1.2', 'future>=0.16.0'],
+    extras_require={'dev': ['pytest>=3.1.2', 'future>=0.16.0']},
+    classifiers=[
+        'Programming Language :: Python',
+        'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.6',
+        'Topic :: Software Development :: Libraries :: Python Modules',
+        'Intended Audience :: Developers',
+        'Operating System :: OS Independent',
+        'License :: OSI Approved :: MIT License',
+    ]
+)

tests/integration/test_package.py

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+"""Tests for the exported bellybutton package."""
+
+
+def test_importable():
+    """Ensure that bellybutton is importable."""
+    import bellybutton

tests/unit/test_yaml.py

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+"""Tests for bellybutton/yaml.py."""
+
+import pytest
+
+import yaml
+
+import bellybutton.parsing
+
+
+@pytest.mark.parametrize('expression', (
+    '- !xpath //*',
+    '- //*',
+    '- !regex .*',
+))
+def test_constructors(expression):
+    """Ensure custom constructors successfully parse given expressions."""
+    yaml.load(expression)

tox.ini

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+[tox]
+skip_missing_interpreters = True
+envlist = py27,py36
+
+[testenv]
+extras = dev
+commands = py.test ./tests